style: add positive attribute to submit buttons (close #113)

web/src/pages/Redemption/EditRedemption.js

@@ -111,7 +111,7 @@ const EditRedemption = () => {
               </Form.Field>
             </>
           }
-          <Button onClick={submit}>提交</Button>
+          <Button positive onClick={submit}>提交</Button>
         </Form>
       </Segment>
     </>